decibels above reference noise


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decibels above reference noise

[′des·ə·bəlz ə¦bəv ′ref·rəns ‚nȯiz]
(electricity)
Units used to show the relationship between the interfering effect of a noise frequency, or band of noise frequencies, and a fixed amount of noise power commonly called reference noise; a 1000-hertz tone having a power level of -90 dBm was selected as the reference noise power; superseded by the adjusted decibel unit. Abbreviated dBrn.